Intrusion detector



FIG. 1 is a front view in perspective of an intrusion detector embodying my new design;

FIG. 2 is a rear view in perspective thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a left side elevational view thereof; and

FIG. 6 is a bottom plan view thereof. 

The ornamental design for an intrusion detector, as shown. 